Removes RC reference from link to installation instructions
Removes RC reference from link to installation instructions

[noissue]

pulp/pulpproject.org,bmbouter/pulpproject.org,bmbouter/pulpproject.org,pulp/pulpproject.org,dkliban/pulpproject.org,dkliban/pulpproject.org,pulp/pulpproject.org,bmbouter/pulpproject.org,pulp/pulpproject.org,bmbouter/pulpproject.org,dkliban/pulpproject.org,dkliban/pulpproject.org